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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands | Common Shares | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Income (loss) | Earnings Attributable to Canadian Solar Inc. | Non-Controlling Interest | Total
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2015 | $ 677,103 | $ (17,139) | $ 218,860 | $ (59,856) | $ 818,968 | $ 13,542 | $ 832,510
Balance (in shares) at Dec. 31, 2015 | 55,965,443 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income |  |  | 65,249 |  | 65,249 | 26 | 65,275
Foreign currency translation adjustment |  |  |  | (44,416) | (44,416) | 2,630 | (41,786)
Issuance of ordinary shares, net of issuance costs | $ 23,408 |  |  |  | 23,408 |  | 23,408
Issuance of ordinary shares, net of issuance costs (in shares) | 1,029,661 |  |  |  |  |  |
Deferred tax on issuance costs of ordinary shares | $ 65 |  |  |  | 65 |  | 65
Transfer of equity interest in subsidiaries to non-controlling shareholders |  |  |  |  |  | 1,648 | 1,648
Share-based compensation |  | 7,757 |  |  | 7,757 |  | 7,757
Tax benefit of share-based compensation |  | 485 |  |  | 485 |  | 485
Exercise of share options | $ 707 |  |  |  | 707 |  | 707
Exercise of share options (in shares) | 835,045 |  |  |  |  |  |
Fair value change on derivatives |  |  |  | 12,458 | 12,458 |  | 12,458
Disposal of a subsidiary |  |  |  |  |  | (3,137) | (3,137)
Balance at Dec. 31, 2016 | $ 701,283 | (8,897) | 284,109 | (91,814) | 884,681 | 14,709 | 899,390
Balance (in shares) at Dec. 31, 2016 | 57,830,149 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income |  |  | 99,572 |  | 99,572 | 3,411 | 102,983
Foreign currency translation adjustment |  |  |  | 39,870 | 39,870 | (565) | 39,305
Acquisition of subsidiaries |  |  |  |  |  | 9,994 | 9,994
Share-based compensation |  | 9,314 |  |  | 9,314 |  | 9,314
Exercise of share options | $ 879 |  |  |  | 879 |  | 879
Exercise of share options (in shares) | 666,536 |  |  |  |  |  |
Fair value change on derivatives |  |  |  | (2,090) | (2,090) |  | (2,090)
Balance at Dec. 31, 2017 | $ 702,162 | 417 | 383,681 | (54,034) | 1,032,226 | 27,549 | $ 1,059,775
Balance (in shares) at Dec. 31, 2017 | 58,496,685 |  |  |  |  |  | 58,496,685
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income |  |  | 237,070 |  | 237,070 | 5,361 | $ 242,431
Foreign currency translation adjustment |  |  |  | (53,457) | (53,457) | 2,880 | (50,577)
Cumulative-effect adjustment for the adoption of ASU 2014-09 | ASU 2014-09 |  |  | 1,265 |  | 1,265 |  | 1,265
Acquisition of subsidiaries |  |  |  |  |  | 7,703 | 7,703
Acquisition non-controlling interest's ownership |  |  |  |  |  | (6,591) | (6,591)
Transfer of equity interest in subsidiaries to non-controlling shareholders |  |  |  |  |  | 10,470 | 10,470
Share-based compensation |  | 10,258 |  |  | 10,258 |  | 10,258
Exercise of share options | $ 769 |  |  |  | 769 |  | 769
Exercise of share options (in shares) | 683,939 |  |  |  |  |  |
De-recognition of derivatives |  |  |  | (8,752) | (8,752) |  | (8,752)
Fair value change on derivatives |  |  |  | 6,094 | 6,094 |  | 6,094
Balance at Dec. 31, 2018 | $ 702,931 | $ 10,675 | $ 622,016 | $ (110,149) | $ 1,225,473 | $ 47,372 | $ 1,272,845
Balance (in shares) at Dec. 31, 2018 | 59,180,624 |  |  |  |  |  | 59,180,624

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